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Restoration Works of Masonry Arch Bridges in Anatolia and Balkans

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Restoration Works of Masonry Arch Bridges in Anatolia and Balkans Istanbul Bridge Conference August 11-13, 2014 Istanbul, Turkey RESTORATION WORKS OF MASONRY ARCH BRIDGES IN ANATOLIA AND BALKANS M. Elbir1, H. Sert2, S. Yılmaz3, E. M. Partal4, H. Demirci5, A. Avşin6, M.Nas7, G.S. Turan8 Translation by: H. İ. Korkmaz9 ABSTRACT It is one of the primary tasks of the General Directorate of Highways to repair and maintain the historic bridges which are of great importance in view of our cultural history in accordance with the projects to be developed or caused to be developed, apart from the recently constructed roads and bridges. Pursuant to the inventory records, it has been observed according to their period of construction (as of December 2013) that there exist a total of 1708 each bridges in our country dating back to Hittite Period (1), Urartian (1), Roman (129), East Roman (22), Seljuk (157), Ottoman (1328) and Early Republican (70) periods with 308 each bridges constructed during Ottoman era abroad. Out of 1708 bridges, such bridges are grouped according to their method of construction as follows: Stone (1625), Wooden (26), Iron (30), Reinforced Concrete (27). The historical bridges the majority of which is located on 1st degree seismic zone and which have proven to be durable for centuries, are considered to serve for a long time in case a relationship between the original construction techniques and soil-foundation- river is established. In this context, during execution of the restoration works which should be carried out in accordance with the least intervention principle, it is of great importance to define original construction systems of the bridges and their material wise characteristics. In the contents of this paper, the restoration works carried out by the General Directorate of Highways for the Stone – arch bridges which are located on the transportation system and which tend to reflect the architectural – engineering experience attained during the period construction and have become the supplementary elements of cultural history as time pass by, shall be discussed. 1 Civil Engineer, Head of department of Structures, General Directorate of Highways, Ministry of Transport, Maritime Affairs and Communication, Ankara. 2 Specialist Architect, Director of the Division of Historical Bridges, Department of Structures, General Directorate of Highways, Ministry of Transport, Maritime Affairs and Communication, Ankara. 3 Senior Architect, Restoration Expert, 4 Civil Engineer, 5 Senior Architect, 6 Senior Architect, Restoration Expert, 7İSenior , 8Archaelogist, 9 Translator/Interpreter / Division of Historical Bridges, Department of Structures, General Directorate of Highways, Ministry of Transport, Maritime Affairs and Communication, Ankara. Restoration Works Of Masonry Arch Bridges In Anatolia And Balkans M. Elbir41, H. Sert2, S. Yılmaz3, E. M. Partal4, H. Demirci5, A. Avşin6, M.Nas7, G.S. Turan8 Translation by: H. İ. Korkmaz9 ABSTRACT It is one of the primary tasks of the General Directorate of Highways to repair and maintain the historic bridges which are of great importance in view of our cultural history in accordance with the projects to be developed or caused to be developed, apart from the recently constructed roads and bridges. Pursuant to the inventory records, it has been observed according to their period of construction (as of December 2013) that there exist a total of 1708 each bridges in our country dating back to Hittite Period (1), Urartian (1), Roman (129), East Roman (22), Seljuk (157), Ottoman (1328) and Early Republican (70) periods with 308 each bridges constructed during Ottoman era abroad. Out of 1708 bridges, such bridges are grouped according to their method of construction as follows: Stone (1625), Wooden (26), Iron (30), Reinforced Concrete (27). The historical bridges the majority of which is located on 1st degree seismic zone and which have proven to be durable for centuries, are considered to serve for a long time in case a relationship between the original construction techniques and soil-foundation- river is established. In this context, during execution of the restoration works which should be carried out in accordance with the least intervention principle, it is of great importance to define original construction systems of the bridges and their material wise characteristics. In the contents of this paper, the restoration works carried out by the General Directorate of Highways for the Stone arch bridges which are located on the transportation system and which tend to reflect the architectural engineering experience attained during the period construction and have become the supplementary elements of cultural history as time pass by, shall be discussed. Introduction It is one of the primary tasks of the General Directorate of Highways to repair and maintain the historical bridges which are of great importance in view of our cultural history in accordance with the projects to be developed or caused to be developed, apart from the recently constructed roads and bridges. In this paper, the restoration works carried out on the stone bridges with arches which are proven to be durable against the factors such as earthquakes, dams and floods for centuries shall be discussed. 1 Civil Engineer, Head of department of Structures, General Directorate of Highways, Ministry of Transport, Maritime Affairs and Communication, Ankara. 2 Specialist Architect, Director of the Division of Historical Bridges, Department of Structures, General Directorate of Highways, Ministry of Transport, Maritime Affairs and Communication, Ankara. 3 Senior Architect, Restoration Expert, 4 Civil Engineer, 5 Senior Architect, 6 Senior Architect, Restoration Expert, 7İSenior , 8Archaelogist, 9 Translator/Interpreter / Division of Historical Bridges, Department of Structures, General Directorate of Highways, Ministry of Transport, Maritime Affairs and Communication, Ankara. Original Construction Systems of the Stone Arch Bridges Large stone blocks have been used on the foundations of the stone arch bridges constructed through masonry construction system and various clamping systems have been developed in order to keep the stones together(Fig. 1,2). It has been observed that the main arches of the multi-spanned bridges were placed on the rocky soil to the extent the topography allows (Fig. 3,4) while the foundation layer was constructed on wooden piles on swampy soil with attenuate bearing strength(Fig. 5,6) and on wooden grills on the sound soils(Fig. 8,9). To divert the water, the piers which are all given shape in different forms to downstream and upstream side and receive the loads from the arches function as supports for the forces which vertically generate onto the longitudinal axis of the bridge, thus provide strength against seismicity. The arches, one of the other element of the bearing system works on pressure and several examples of bridges imply that the supports on the arches are formed through flexible connection system made with wooden elements (Fig. 7,8). If we have a look at the examples of the bridges constructed in different periods, Aspendos (Belkıs) Bridge constructed during Seljuk Period in 13th Century on the foundation and ruins which date back to Roman Period is on Köprüçay River in Antalya and it is 220 m length with 7 spans. The foundations of the bridge located on 2nd degree seismic zone is formed through connecting the largely dimensioned stone blocks with each other by way of iron clamps of 1.75 m.(Fig. 1,2). 1986 Fig. 1,2. Aspendos (Belkıs) Bridge,Antalya/iron clamps used on the bridge foundations Malabadi Bridge, built during Seljuk Period (12th Century) is on Batman River in Diyarbakır and it is 220m in length with 5 spans. It is the only stone bridge with the longest arch span survived to date in the world together with the pointed arch of 40,86m span located on rocky soil. To decrease the loads on the foundations, the chambers within the body of the Bridge of Malabadi, located on 1st degree seismic zone, are specifically functioned where one of the rooms includes a toilet (Fig. 3,4). 2014 Fig. 3,4. Malabadi Bridge, Diyarbakır/ the bridge constructed on rocky soil Kesikköprü constructed during Seljuk Period (13th Century) is located on Kızılırmak River in Sivas District and it is 227m in length with 17 spans in flat pointed form. It is observed that the bridge foundation which is located on 3rd degree seismic zone rests on wooden piles (Fig. 5, 6). 2011 Fig.5,6. Kesikköprü, Sivas/ the bridge constructed on wooden piles Constructed during Ottoman Period (16th Century) Mostar Bridge, was built by Architect Hayreddin, one of Architect Sinan’s disciples in the city of Mostar in Bosnia and Herzegovina and its arch with 28.71m spanning was settled on stone platforms supported by the rocks. During re-construction works executed on the bridge in 2002 through 2003, it has been observed that the springer stones of the arch were settled on a flexible connection system made up of wooden elements (Fig. 7,8). 2012 Fig. 7,8. Mostar Bridge, BIH / wooden beams in line with the arch springer The Historical Konjic Bridge, one of the masterpieces constructed during Ottoman Period (17th Century) is located on River Neretva in the city of Konjic in Bosnia and Herzegovina and it is 86,20m long with 6 spans in flat pointed arch form. It has been observed that the foundation system of the bridge which is located in 3rd degree seismic zone was formed through wooden grill system which directly settled on the rocky formation (Fig. 9,10). 2012 Fig. 9,10. Konjic Bridge, Bosnia and Herzegovina/ bridge constructed on wooden grills Assessment: It has been understood that the seismic forces transferred by the soil to the structure by way of the flexible energy absorbing elements functioning as “elastomer support” on which the foundations, piers and arches of the masonry bridges which form part of the bearing systems, are settled, tend to decrease. Where the original environmental conditions change / cause to be changed, the dynamic effects of the earthquakes which may have sudden impact on the structure and display substantial changes in short intervals may give way to damages of larger scale for the bridges which lost their stability.
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